Nonlinear oscillations of magnetization for ferromagnetic particles in the vortex state and their ordered arrays

The dynamics of magnetization oscillations with a considerable amplitude and a radial symmetry in small ferromagnetic particles in the form of a thin disk with a magnetic vortex has been investigated. The collective variables that describe radially symmetric oscillations of the magnetization dynamic...

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Bibliographic Details
Published in:	Journal of experimental and theoretical physics Vol. 109; no. 1; pp. 74 - 89
Main Authors:	Galkin, A. Yu, Ivanov, B. A.
Format:	Journal Article
Language:	English
Published:	Dordrecht SP MAIK Nauka/Interperiodica 01-07-2009
Subjects:	AMPLITUDES ANGULAR MOMENTUM Classical and Quantum Gravitation CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Disorder Elementary Particles FERROMAGNETIC MATERIALS FERROMAGNETISM MAGNETIC FIELDS MAGNETIC MATERIALS MAGNETISM MAGNETIZATION MATERIALS MATERIALS SCIENCE NONLINEAR PROBLEMS Order OSCILLATIONS Particle and Nuclear Physics PARTICLE PROPERTIES PARTICLES Phase Transition in Condensed System Physics Physics and Astronomy Quantum Field Theory QUASI PARTICLES Relativity Theory Solid State Physics SOLITONS SPIN VORTICES 75.50.Ee 75.50.Xx 75.50.Tt 75.45.+j
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Summary:	The dynamics of magnetization oscillations with a considerable amplitude and a radial symmetry in small ferromagnetic particles in the form of a thin disk with a magnetic vortex has been investigated. The collective variables that describe radially symmetric oscillations of the magnetization dynamics for particles in the vortex state are introduced, and the dependence of the particle energy is studied as a function of these variables. The analytical expressions describing the frequency of magnetization oscillations with a radial symmetry, including nonlinear oscillations, are derived using the collective variables. It is shown that the presence of a magnetic field oriented perpendicular to the particle plane reduces the oscillation frequency and can lead to hybridization of this mode with other modes of spin oscillations, including the mode of translational oscillations of the vortex core. The soliton solutions describing the propagation of collective oscillations along the chain of magnetic particles are found.
ISSN:	1063-7761 1090-6509
DOI:	10.1134/S1063776109070103